To the best of my knowledge you have to be outside Thailand to apply for a tourist visa. Anything done inside the country would be an extension to that visa

Apply via the official Thai e-visa site:

Get a 90 day Non-O visa. Reason, visiting or staying with applicants family resided in Thailand (more than 60 days), easy to do. You can write a letter of invitation with the approval of your inlaws, include a copy of their ID card in the letter.

Thai isn't too hard to pick up at a basic level.

YouTube has plenty of resources and that is where I started.

Learn to read/write at a basic level, it really helps especially if you want something more than the usual tourist nonsense.

As mentioned earlier the book "Thai for beginners" by Benjawan Poomsan Becker is very good and they also provide an excellent English/Thai dictionary app.

Additionally Facebook, instagram and Tiktok have many many Thai language learning resources.

Reading and writing will take you a long way and improve your conversation. It looks hard, but honestly it's not that difficult once you can identify the words.

Yes, filter the statement to show only the pension payments covering the relevant period of time required.

No, but it's quite likely you may need one to get a job. You need employment to get a work permit.

Dude it's the same country of course you don't need a different/new visa

July/August are probably the worst months to book flights from the UK due to the school summer holiday period. I always fly direct with either Thai or EVA, there's not much between them however I'd generally pick EVA over Thai

You have no time to apply before flying now, so I would seek an extension after arrival.

@Tyla **********

what visa did you apply for?

You can apply for a 60 tourist visa before travelling, they're easy to do and should not take long to be approved. It will be cheaper and easier than seeking an extension in Thailand.